<template>
    <el-container class="home-container">
        <!-- 头部区域 -->
        <el-header>
            <div>
                <img src="../assets/heima.png" alt="">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
            <!-- 页面主体区域 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside :width="isCollapse?'64px':'200px'">
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!-- 侧边栏菜单区域 -->
                <el-menu
                background-color="#333744"
                text-color="#fff"
                active-text-color="#409eff"
                :unique-opened='true'
                :collapse="isCollapse"
                :collapse-transition="false"
                :router="true"
                :default-active="activePath">
                <!-- 一级菜单 -->
                    <el-submenu :index="item.id+''" :key="item.id" v-for="item in menulist">
                        <!-- 一级菜单的模板区域 -->
                        <template slot="title">
                            <!-- 图标 -->
                            <i :class="iconsObj[item.id]"></i>
                            <!-- 文本 -->
                            <span>{{item.authName}}</span>
                        </template>
                            <!-- 二级菜单 -->
                        <el-menu-item :index="'/'+subItem.path" :key="subItem.id" v-for="subItem in item.children" @click="saveNavState('/'+subItem.path)">
                            <template slot="title">
                                <!-- 图标 -->
                                <i class="el-icon-menu"></i>
                                <!-- 文本 -->
                                <span>{{subItem.authName}}</span>
                            </template>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!-- 右侧内容主题 -->
            <el-main>
                <!-- 路由占位符 -->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
    data(){
        return {
            menulist:[],
            //是否折叠
            isCollapse:false,
            iconsObj:{
                '125':'iconfont icon-users',
                '103':'iconfont icon-tijikongjian',
                '101':'iconfont icon-shangpin',
                '102':'iconfont icon-danju',
                '145':'iconfont icon-baobiao'
            },
            //被激活的链接地址el-menu菜单的default-active激活
            activePath:''
        }
    },
    created(){
        this.getMenuList()
        this.activePath=sessionStorage.getItem('activePath')
    },
    methods:{
        logout(){
            sessionStorage.clear()
            this.$router.push('/login')
        },
        //获取所有的菜单
        async getMenuList(){
            const {data:res}=await this.$http.get('menus')
            if(res.meta.status!==200) return this.$message({showClose: true,message: res.meta.msg,type: 'error',duration:1000})
            this.menulist=res.data
        },
        //左侧菜单栏的折叠展开按钮
        toggleCollapse(){
            this.isCollapse=!this.isCollapse
        },
        //保存链接的激活状态
        saveNavState(activePath){
            sessionStorage.setItem('activePath',activePath)
            this.activePath=activePath
        }
    }
}
</script>

<style lang="less" scoped>
    .home-container{
        height: 100%;
    }
    .el-header{
        background-color: #373d41;
        display: flex;
        justify-content: space-between;
        padding: 0 20px;
        align-items: center;
        color: #fff;
        font-size: 22px;
        >div{
            display: flex;
            align-items: center;
            span{
                margin-left: 15px ;
            }
        }
    }
    .el-aside{
        background-color: #333744;
        .el-menu{
            border-right: none;
        }
    }
    .el-submenu__title span{
        font-size: 12px;
        margin-left: 10px;
    }
    .el-menu-item{font-size: 12px;}
    .el-main{
        background-color: #eaedf1;
    }
    .toggle-button{
        background-color: #4a5064;
        font-size: 12px;
        line-height: 22px;
        text-align: center;
        color: #fff;
        letter-spacing: 0.12em;
        cursor: pointer;
    }
</style>